Attention: TDR Forum Junkies 
Exactly the same thing happened to me. This was my solution (posted on another website a few years ago):
Once you've determined your wheels are not coming off by kicking or hitting them spray around the studs (w/ the lugnuts off) and the axle hub w/ PB Blaster. It softens up the corrosion.
For the next step I had to go to our local high school. If you have a moderately long asphault driveway you can do this at home. I do not. At the high school I loosened the lugnuts so they were about 3/8 to 1/2 inch from the rim on 1 wheel (I only did this trick on the back wheels as I was able to get the fronts off using a less drastic measure). Then I grabbed second, got up to about 10 mph, then hit the brakes, hard. In my case the wheels did not come off the backing plate, it just rotated the wheel relative to the studs (studs were up against one side of the hole instead of being centered). I then repeated the process going backwards (accelerate then break hard) to get the studs to touch the other side of the hole.
Jack up the side you have loose and tighten the lugnuts. I started by doing one and getting it slightly snug and then moving in a circular pattern. This will pull the rim back to center on the lugs. You'll notice after you've done all eight that the first one will be loose so just repeat. You have to do this before trying to get the wheel off because most likely the studs are somewhat in embedded in the rim (you'll see the thread marks in the holes once you get the rim off). With a couple taps from a sledge hammer the wheel will pop off. Repeat for the other rear wheel.
To get the fronts off, I again loosened all the lugnuts about a 1/2 inch then turned the wheel and back and forth several times. Spraying with PB Blaster is higly reccomended but a few hammer hits will be required.
Once you've determined your wheels are not coming off by kicking or hitting them spray around the studs (w/ the lugnuts off) and the axle hub w/ PB Blaster. It softens up the corrosion.
For the next step I had to go to our local high school. If you have a moderately long asphault driveway you can do this at home. I do not. At the high school I loosened the lugnuts so they were about 3/8 to 1/2 inch from the rim on 1 wheel (I only did this trick on the back wheels as I was able to get the fronts off using a less drastic measure). Then I grabbed second, got up to about 10 mph, then hit the brakes, hard. In my case the wheels did not come off the backing plate, it just rotated the wheel relative to the studs (studs were up against one side of the hole instead of being centered). I then repeated the process going backwards (accelerate then break hard) to get the studs to touch the other side of the hole.
Jack up the side you have loose and tighten the lugnuts. I started by doing one and getting it slightly snug and then moving in a circular pattern. This will pull the rim back to center on the lugs. You'll notice after you've done all eight that the first one will be loose so just repeat. You have to do this before trying to get the wheel off because most likely the studs are somewhat in embedded in the rim (you'll see the thread marks in the holes once you get the rim off). With a couple taps from a sledge hammer the wheel will pop off. Repeat for the other rear wheel.
To get the fronts off, I again loosened all the lugnuts about a 1/2 inch then turned the wheel and back and forth several times. Spraying with PB Blaster is higly reccomended but a few hammer hits will be required.
Good luck!!
